I have an optima 2000 sitting in my safe at home. I put it on the wifes plate gun, and it wouldnt hold calibration. I sent it back, and got a new one. installed it and it did the same. after 3 tries, I gave up on it. I put a psa 30mm red dot on it, and it works great. I have a tasco propoint 3 on mine, and it works well. if only the optima had worked out, it would have been great. It is a real light weight and great idea. If you do decide to try one Evolution gun works makes the best mounts for it.